http://stackoverflow.com/q/36011981/3255152

ParallelNashornTest.java

import com.google.common.collect.Iterators;
import jdk.nashorn.api.scripting.ScriptObjectMirror;
import org.testng.Assert;
import org.testng.annotations.DataProvider;
import org.testng.annotations.Test;

import javax.script.*;
import java.io.FileNotFoundException;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

public class ParallelNashornTest {
    private static final String SCRIPT = "var Thread = Java.type(\"java.lang.Thread\");\n" +
            "var referenceNumberValid = \"0000\";\n" +
            "var referenceNumberInvalid = \"0001\";\n" +
            "\n" +
            "function validate (parameters) {\n" +
            "    var isValid = false;\n" +
            "    var statusCode;\n" +
            "    var referenceNumber = parameters.referenceNumber;\n" +
            "    var validateNumber = referenceNumber.substr(0, 7);\n" +
            "    var sum = 0;\n" +
            "\n" +
            "    for (ctr = 0; ctr < validateNumber.length; ctr++) {\n" +
            "        sum += parseInt(validateNumber.substr(ctr, 1));\n" +
            "    }\n" +
            "\n" +
            "    var checkDigit = sum % 10;\n" +
            "    isValid = parseInt(referenceNumber.substr(7, 1)) == checkDigit;\n" +
            "    statusCode = isValid ? referenceNumberValid : referenceNumberInvalid;\n" +
            "\n" +
            "    print(\"Thread: \" + Thread.currentThread().getId() + \", isValid: \" + isValid + \", referenceNumber: \" + referenceNumber + \", validateNumber: \" + validateNumber + \", sum: \" + sum + \", checkDigit: \" + checkDigit + \", statusCode\" + statusCode);\n" +
            "\n" +
            "    return statusCode;\n" +
            "}";
    private ScriptEngine engine = new ScriptEngineManager().getEngineByName("nashorn");
    private CompiledScript script;

    public ParallelNashornTest() throws ScriptException {
        Compilable compilable = (Compilable) engine;
        script = compilable.compile(SCRIPT);
    }

    @Test(dataProvider = "validReferenceNumbers", timeOut = 3000)
    public final void testValidReferenceNumber(String referenceNumber) throws ScriptException {
        Map<String, String> parameters = new HashMap<>();
        parameters.put("referenceNumber", referenceNumber);
        Bindings bindings = engine.createBindings();
        script.eval(bindings);
        ScriptObjectMirror scriptObjectMirror = (ScriptObjectMirror) bindings.get("validate");
        Object result = scriptObjectMirror.call(null, parameters);
        String statusCode = ((String) result).substring(0, 3);
        Assert.assertEquals(statusCode, "000");
    }

    @DataProvider(name = "validReferenceNumbers", parallel = true)
    private Iterator<Object[]> validReferenceNumbers() throws FileNotFoundException {
        return Iterators.forArray(
                new Object[]{"18058888"},
                new Object[]{"17098881"},
                new Object[]{"18028885"},
                new Object[]{"17058887"},
                new Object[]{"17028884"},
                new Object[]{"07009882"},
                new Object[]{"07034880"}
        );
    }
}